Valve-controlling device.



C. A. PARSONS, A. Q. CARNEGIE & G. L. PARSONS.

VALVE CONTROLLING DEVICE.

APPLLCATION FILED FEB. 3. 1913.

l 1 4 1 ,824. Patented J une l, 1915.

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THE` MORRIS PETERS C0.. PHDTG-LITHO.. WASHINGTON. D. c

C. A. PARSONS, A. Q. CARNEGIE & G. L. PARSONS. VALVE CONTROLLING DEVICE.

APPLICATION FILED FEB. 3, 1913- 1,141,824. Patented June 1, 1915.

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Y To all whom 'it may concern:

CHARLES ALGERNON PARSONS, ALFRED QUINTIN CARNEGIE, AND GEOFFRY LAW- RENCE PARSONS, OF N EWCASTLE-UPON-TYNE, ENGLAND; SAID GEOFFRY LAWRENCE PARSONS AND ALFRED QUINTIN CARNEGIE ASSIGNORS TO SAID CHARLES ALGER- NON PARSONS. c

VALVE-CONTROLLING DEVICE.

Specicaton of Letters Patent.

1,141,824, Patented aune i, reis..

Application led February 3, 1913. Serial No. 746,026.

provided upon each valve, while in Fig. 2

Be it known that we, CHARLES ALGERNON a single operating device is adapted to move PARSONS, K. C. B., ALFRED QUiNTrN CARNE- the controlling means on both valves, These Gin, and Gnorrnr LAWRENCE PARSONS, all controlling means are separate from the subjects of the King of Great Britain and Speed regulating gear of the plant, and Ireland, and all residing at Heaton Works, control the opening and closing of the valves Newcastle-uponTyne, in the county of independently of such gear. 6o Northumberland, England, have invented In the form of the invention shown in certain new and useful Improvements in and ig. l, the high and low pressure valves are Relating to Valve-Controlling Devices of of the type in which the opening and closing Plants Using Elastic Working Fluid from is regulated by means of slides, a, controla Plurality of Sources, of which the followling the exhaust of pressure fiuid from the ing is aspecification. Y under side of pistons, o, attached to the This invention relates to improvements in valve stems, c, the admission of the prescontrolling devices for the valves of plants sure fluid to the under side of these pistons using elastic working fluids from a plurality being regulated by a suitable controlling of sources at the same or at differentpresvalve, d. The ordinary speed regulating 7o sures, its object being to enable the change gear of the plant, such as the governor, e, from one source of supply to another to be is arranged to operate by means of a lever, f, effected without variation in the speed of the directly upon the slide, a, controlling the turbine. low pressure valve, g, and at the same time 'Ihe invention consists in valve controlling through the intermediary of the coupling, L, 75 devices for such plant comprising in reand lever, i, upon the slide, a, controlling the spect of each valve to permit the opening high pressure valve, j. This speed regulatand closing thereof, means acting responlng gear is arranged so that the turbine can sively to the speed regulating gear of the be driven from either the high or low presplant, and additional means acting responsure supply without a change of speed. so sively to pressure variations on the supply Mounted on the casing of both the high side of one valve, saidV additional means beand low pressure valves is a cylinder, la, ing entirely separate from the speed rein which moves a piston, m. The upper side sponsive means. of this piston is open to the air, while the The invention also consists in valve conunder side is connected to the space on the trolling devices as hereinafter described. supply side of the low pressure valve. The

The accompanying drawings illustrate movement of the piston, m, may be consuitable valve arrangements and controlling trolled by means of suitable springs so that devices'therefor for turbines supplied Vwith its movement will be proportional to the steam from two sources at different prespressure of the low pressureA supply. In the sures, viz., a high pressure supply and a low case of the piston mounted on the casing of pressure supply from a receiver, accumulathe low pressure valve, communication is eftor or the like. fected by means of a passage, n, formed in According to the invention, means are the valve casing itself, while in the case provided for controlling the opening and of the piston in the cylinder mounted on the closing of the valve in the delivery' of each high pressure valve, communication is eilectsource of supply inversely to one another, ed by means of the pipe, o. In this way the and dependently upon the pressure on the under side of each of the pistons, m, is subsupply side of the low pressure valve, viz., jected to the pressure on the supply side upon the pressure on the side toward the reof the low pressure valve, that is, to the ceiver, accumulator or the like. pressure on the side toward the receiver, ac-

Figure l is a sectional elevation of one mulator or the like. Attached to each of the form of the invention. Fig. 2 is an elevation pistons, m, is a slide, p, which is adapted to partly'in section of a modification. control in parallel with the slides, a, the eX- ;As illustrated 1n Flg. l, separately ophaust of the pressure fluid from the under 105 erated controlling means of this nature are side of the piston, b. The two pistons, m,

and the attached slides, p, are arranged so that when the one controlling the exhaust from the piston, b, on the valve stem, c, of the low pressure valve, g, is in the posi- 5 tion to maintain this valve in the closed position, the slidecontrolling the exhaust fromy the under side of the piston, b, attached to the stem, c, of the high pressure valve, j,

is in the position to maintain this valve both the high pressure and the low pressure valves act in parallel to control the exhaust of the pressure fluid acting on the pistons of these valves then so long as either of the slides, p, is in the position to maintain its corresponding valve shut, this valve will be in no way affected by the movement of the slide, a, received from the speed regulating governor, e, while if the slide, p, is in the position to maintain its corresponding valve open, then this valve is subject to the movements of the slide, a, from the speed regulating governor.

Both the slides, a and 79, control the eX- haust of the pressure fiuid from the under side of the pistons, b, by allowing this iluid to escape through the passage, g, into the chamber, r, which may be connected to the condenser orV atmosphere, as may be conven- 30' ient.

It will be seen that the slides, p, with the pistons, m, which form the additional controlling means to bothV valves, operate dependently upon the same pressure and also act inversely. The operation of the plant is as Jfollows z-Assuming that there is a sufficient supply of low pressure steam, the pressure of this steam infront of the low pressure valve, g, will move the piston, m, connected to the slide, p, controlling the low pressure valve, into the position Vat which the slide itself closes the exhaust for the low pressure iiuid from the under side of the Y valve, b, on the stem, c, of this low pressure valve, g. Under these conditions the low pressure valve is then under the control only Vof the slide, a, moved by the speed regulating governor, e. pressure in front of the low pressure valve moves the piston, m, and the slide, p, controlling the high pressure valve into the position in which the exhaust from the un- -der side of the piston, 2) attached-to the stem, c, and the high pressure. valve, j, is (maintained open. In this way the high pressure valve remains closed. Should the supply of low'pressure steam become insufficient so 'that the pressure in front of the low pressure valve falls, then the piston, m,

' .50 and slide, 0, attached to each valve,move so that the low pressure valve, g, beginsto close while the high pressure valve is put under the control of the speed regulating gear of the plant and begins to open. Should the supply of low pressure steam cease. altoopen. Since the slides, a and p, attached to At the same time, the

that any changes will Vbe f ply. The admission of high or low pressure Y steam is always under the control ofthe speed regulating `gear of the plant, thus enabling the change from one source of supply to another to be effected without any variation in the speed of the' turbine.- VThe additional controlling means, viz., the pistons, m, and slides, p, determine when the high pressure and low pressure valves shall open or close, or how much of each valve shall be open simultaneously. Theseadditional controlling-means are also entirely separate from the speedregulating governor, e, and control only a complete or partial change over from one sourceoll supply to the other; VV;

In the form of the invention shown' in Fig. 2, the high and-low pressure valves are each provided with a slide, a, asin Fig. V1, which are operated in a similar manner-by the speed regulating governor e. Both valves are also provided with yadditional slides, p. The slide, p, attached to the highv pressure valve, however, is connected b-y means of a coupling, s, toa lever, t, attachedk to Ythe slide, p, for the low pressure valve.

On thelow pressure valve in asimilar man- Vner as shownin Fig. 1, is mounted a cylinder, 7c, containing: a piston` m, to which is attached tlie'slide, p, of the V'low Vpressure. valve. The operation of this arrangement is exactlysimilar to that asdescribed in connection with the arrangement shown in-'Fig Y Y Y 1, but it will be seen that the additional controlling means for the high Vand low pressure valves have been combined and arranged to be operatedby aA single piston. m.

the slide, p, cor- Y the speed regulating gear. of the plant, and

the other set` acting :responsively to pressure variations on the'supply .side ofV one-valve, this latter means being entirely separate Y This inventionl may be applied generally to plant using elastic working fluid from a plurality of sources: at the same or at'diier- `from that responsive to the speed regulating Y l 'the same.

Having noW described our invention What We claim as nevi7 and desire to secure by Letters Patent is l. The combination With a mixed pressure turbine having loW and high pressure supply conduits and valves controlling the same of independent motors for actuating each of said valves and separate pairs of controlling means for each of said motors each of said pairs comprising a speed responsive device and a pressure responsive device said devices operating in series.

2. The combination With a mixed pressure turbine having low pressure and high pressure supply conduits and valves controlling the same of independent motors for actuating each of said valves separate independent speed responsive means in conjunction With each of said motors said means acting simultaneously and in the same sense separate independent pressure responsive means in conjunction With said motors said pressure responsive means acting simultaneously and inversely.

Y 3. The combination with a mixed pressure turbine having a low pressure and high pressure supply conduits and valves controlling the same of independent motors for actuating each of said valves a relay slide valve for each of said motors a speed responsive device controlling said relay valves secondary slide valves beyond said relay valves and means responsive to the pressure in the loW pressure supply conduit controlling said secondary valves and said motors independently of the speed responsive device.

4. The combination With a mixed pressure turbine having low pressure and high pressure, supply conduits and valves controlling the same of independent motors for actuating each of said valves a relay slide valve for each of said motors a speed responsive device controlling said relay valves simultaneously to open or close the same secondary slide valves beyond said relay valves and means responsive to the pressure in the 10W pressure supply conduit controlling said secondary valves and said motors simultaneously and inversely independently of the speed responsive device.

In testimony whereof, We aiix our signatures in presence of tWo Witnesses.

CHARLES ALGERNON PARSONS. ALFRED QUINTIN CARNEGIE. GEOFERY LAWRENCE PARSONS.

Witnesses:

FREDERICK GORDON HAY BEDFORD, ALBERT WiLLrAM PARR.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, I). C. 

